This JNCIA-JUNOS practice question tests your understanding of user interfaces. Examine the command output carefully: the correct answer depends on what the output actually shows, not on general recall alone. After answering, compare your reasoning against the explanation and wrong-answer breakdown below. Once you have made your selection, read the full explanation to reinforce the concept and understand why each distractor is designed to mislead on exam day.
user@router> show configuration | display set | match "ge-0/0/0" set interfaces ge-0/0/0 unit 0 family inet address 10.0.0.1/24
Refer to the exhibit. An engineer runs the command but sees no output. What is the most likely reason?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue: "most likely"
Why it matters: Probability qualifier — the question wants the most probable cause or outcome, not a guaranteed one. Eliminate low-probability options.
user@router> show configuration | display set | match "ge-0/0/0" set interfaces ge-0/0/0 unit 0 family inet address 10.0.0.1/24
The pipe (|) is not supported with 'display set'.
Why wrong: Pipe is supported.
The interface ge-0/0/0 is not configured.
Most likely the interface does not exist in config.
The interface name is misspelled.
Why wrong: No typo evident.
The command syntax is incorrect.
Why wrong: Command syntax is correct.
Answer choices
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
The interface ge-0/0/0 is not configured.
The command 'show configuration | display set' outputs the configuration in a set-based format. If there is no output, it means the configuration is empty or the specified interface does not exist. In this case, the interface ge-0/0/0 is not configured, so the filter 'display set' returns no lines for that interface. Option B is correct because an unconfigured interface yields no configuration output.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Answer analysis
For each option: why learners choose it and why it is or isn't the right answer here.
The pipe (|) is not supported with 'display set'.
Why it's wrong here
Pipe is supported.
The interface ge-0/0/0 is not configured.
Why this is correct
Most likely the interface does not exist in config.
Clue confirmation
The clue word "most likely" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
The interface name is misspelled.
Why it's wrong here
No typo evident.
The command syntax is incorrect.
Why it's wrong here
Command syntax is correct.
Common exam traps
The trap here is that candidates may assume the pipe command is unsupported or that the syntax is wrong, when in fact the absence of output is due to the interface not being configured in the candidate or active configuration.
Trap categories for this question
Command / output trap
Command syntax is correct.
Detailed technical explanation
The 'display set' pipe command converts the hierarchical 'show configuration' output into a flat list of 'set' commands, which is useful for scripting or comparing configurations. If an interface is not configured, it does not appear in the configuration hierarchy at all, so the filter produces no output for that specific interface. In Junos, interfaces must be explicitly configured under 'interfaces' to appear in the configuration; otherwise, they are considered absent.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
A practitioner preparing for the JNCIA-JUNOS exam encounters this exact type of scenario on the job. The correct answer here is not the most general option — it is the best answer for the specific constraint described. Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option. Real exam questions reward reading the full scenario before eliminating options, because the constraint defines which answer fits.
What to study next
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FAQ
User Interfaces — This question tests User Interfaces — Read the scenario before looking for a memorised answer..
The correct answer is: The interface ge-0/0/0 is not configured. — The command 'show configuration | display set' outputs the configuration in a set-based format. If there is no output, it means the configuration is empty or the specified interface does not exist. In this case, the interface ge-0/0/0 is not configured, so the filter 'display set' returns no lines for that interface. Option B is correct because an unconfigured interface yields no configuration output.
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Yes — watch for: "most likely". Probability qualifier — the question wants the most probable cause or outcome, not a guaranteed one. Eliminate low-probability options.
Read the scenario before looking for a memorised answer.
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Last reviewed: Jun 11, 2026
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